Why is ther no formula to figure out port volume?

Did you have a head in mind for use?

Cam wise, I think I would go somewhere around a 236 @ .050 (Hyd cam) and a few more degrees on a split duration at most if at all dependent on head flow. But, ethier way, if your doing Edelbrocks, I'm guessing a pocket porting and gasket match would be OK since it's generaly speaking, a low RPM engine